# NCERT Class 9/Class 9 Science Chapter 3 Atoms and Molecules Sample Test,Sample questions

## Question: `3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are`

1. 6.68 Ã— 1023

2.6.09 Ã— 1022

3. 6.022 Ã— 1023

4.6.022 Ã— 102321

## Question: `A change in the physical state can be brought about`

1.only when energy is given to the system

2.only when energy is taken out from the system

3.when energy is either given to, or taken out from the system

4.without any energy change

1.32 times

2.12 times

3. 8/3 times

4.12/32 times

1.40

2.30

3.48

4.36

1.Ni

2.N2

3.N+

4. N

1. So

2.Sd

3.NA

4.Na

## Question: `The molecule having an atomicity of 4 is:`

1.Sulphate molecule

2.Ozone molecule

3.Phosphorus molecule

4.Methane molecule

1.6 Ã— 1022

2. 6

3.12 Ã— 1023

4.1.2 Ã— 1023

1.250 amu

2.250 g

3.248 amu

4.248 g

1.6.0 Ã— 1024

2.6.01 Ã— 1022

3. 6.022 Ã— 1023

4.6.022 Ã— 10-23

1.11.0 g

2.22.0 g

3.4.4 g

4. 44.0 g

1. 1 g of CO2

2.1 g of N2

3.1 g of H2

4.1 g of CH4

1. (i)

2.(i) and (iv)

3.(ii) and (iii)

4. (ii) and (iv)

1.18 g H2O

2.18 g of O2

3.18 g of CO2

4.18 g of CH4

1.18 g of H2O

2.18 g of O2

3.18 g of CO2

4.18 g of CO4

## Question: `Which of the following represents 12 u?`

1.Mass of 1 hydrogen atom

2.Mass of C-12 atom

3.Mass of 0-16 atom

4.1/12th of mass of C-12 atom.

## Question: `Which of the following would weigh the highest?`

1.0.2 mole of sucrose (C12H22O11)

2.2 moles of CO2

3.2 moles of CaCO3

4.10 moles of H2O

## More MCQS

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